The location of the obstacle course, Transformation Fitness Studios, often gets crowded. Therefore, the company opened a second location, Reflections of You, on the other side of town. The obstacle course at Reflections of You is the same as the one at Transformation Fitness Studios, except it is a horizontal reflection. This means all the checkpoints have been reflected in the y-axis. Using the checkpoints at Transformation Fitness Studios, A(0,5), B(−9,5), and C(−4,5), find the coordinate locations of their respective checkpoints, A′, B′, and C′, at the Reflections of You obstacle course.

A′(0,5), B′(9,5), C′(4,5)
A′(0,−5), B′(−9,−5), C′(−4,−5)
A′(0,5), B′(−9,5), C′(−4,5)
A′(0,5), B′(9,5), C′(−4,5)